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You don't need a firewall; you just need not to be listening on a port. And if you want to receive a file on a port, you can … start listening on it.

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I wish I could upvote this 1000 times. Most firewalls are just so much security theater cargo culting. NAT and universal firewalls have done immeasurable, and at this point practically irreversible, damage to network freedom and free software.

And exploits

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